Earlier you must have seen the post.ly domain in shortened URLs from Posterous blogs. Yesterday Posterous formally launched the post.ly URL shortener as a separate service.
Post.ly is a simple and powerful site for posting all kinds of files from your computer to Twitter. The best part about post.ly is that it is backed by Posterous, so it comes with all the features of posterous.com.
You can customize your theme, use your own domain, and add in your own analytics. What's more, with our the autopost capabilities there's no reason to stop at just Twitter; post.ly will autopost your post anywhere that Posterous will.
I know you've got something on your hard drive you're dying to share. So why don't you get going!